This is a minute and second countdown timer with external connection of power and keys. The counting capacity is 99 minutes 59 seconds. It is 16 mm digit height countdown timer module with 4 special optional features for certain purpose. Please consult the features listed below. External connection pads for power source, keys, and output poles are at both edges of PCB. Upon request, 5 output poles with different waveform are available. Many kinds of counting capacity are available too. Under special request, it is possible to program the timer to fix the counting interval at a certain value to manipulate the power switch of certain device in a constant interval.